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The ADTRAN TSU LT is a low cost, full-featured T1/FT1 Data Service/ Channel Service Unit (DSU/CSU). The TSU LT provides an interface between T1 or Fractional T1 service and the end user's Data Terminal Equipment (DTE) for applications such as LAN to LAN bridging, Frame Relay circuit termination and videoconferencing. The TSU LT provides access to traditional dedicated point-to-point T1 services as well as network termination for Frame Relay. Housed in a compact, durable plastic housing the TSU LT supports synchronous data rates from 56 Kbps to 1.536 Mbps at Nx56 or Nx64 Kbps. A single V.35 physical interface provides a connection to the end user's DTE equipment.
For configuration and testing, the TSU LT provides the capability to control a remote TSU LT through the T1 FDL channel. If the FDL channel is unavailable, the TSU LT can use 8 kbps of the data traffic to provide configuration and control of the remote unit. The in-band control channel is used on an as-needed basis and is automatically controlled by the TSU LT. The TSU LT responds to standard local and remote loopback commands from the telephone company central office. In addition, the user has several built-in test capabilities including V.54 remote loopback and 511 BERT test patterns.
modular approach allows the ADTRAN TSU family to serve in point to point T1 applications with a mixture of voice, data and video.